Abstract
The effects of the counterions, Li +, Na + and tetramethylammonium (TMA +) of dodecyl sulfates on the interaction of poly(ethylene oxide) (PEO) have been investigated conductimetrically. For tetramethylammonium dodecyl sulfate (TMADS), significant effects on the classical conductivity vs surfactant profiles should be expected, compared to those for lithium dodecyl sulfate (LDS) and sodium dodecyl sulfate (SDS), since the main driving forces of the polymer binding should be attributed to the counterion. However, it has been found that the conductivity breakpoints, the critical aggregation concentration ( cac) and the polymer saturation point ( psp), and also other characteristics of the conductivity profiles investigated, such as linearity of the cac-psp region, ratios of slopes related to the degrees of dissociation of the polymer-surfactant complexes and micelles, and the amount of the complexed surfactant per monomol of PEO, do not exhibit differences sufficient to justify the importance of the counterion in the mechanism of polymer-surfactant interaction.
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